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penguin-bio-wheel-all-modelsI have the penguin 350 with dual biowheels. It seems to be working really well and it definitely starts more easily than my emperor 40. However I really dislike the fact that there is no way to control the water flow. The other drawback is that the output lips are very short and to avoid splashing it requires a very high water level. Regardless, for the price it works really well.